Croaker
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Yes, sounds like you are plotting H=1/B (closed-loop gain) and A (open-loop gain) on the same graph, and the difference is the loop-gain. OK.
Your assumption is correct assuming the A*B >> 1 and 1/B intersects at a -20 dB point. Maybe you have a second pole in your open-loop response. If so, there will be an increase in downward slope, though sometimes it's a little tricky to see.
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